William -r



W. R. PATTERSON.

('No Model.)

MAGNETO BELL.

No. 444,600. Patented Jain. 13,1891.

@2444 @JZW @d/icf UNITED STATES PATENT IFFICE.

WILLIAM R. PATTERSON, OF CHICAGO, ILLINOIS, AS SIGNOR TO THE I/VESTERNELECTRIC COMPANY, OF SAME PLACE.

MAGNETO-BELL.

SPECIFICATION forming part of Letters Patent No. 444,600, dated January13, 1891.

Application filed May 27, 1890. Serial No. 353,295. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM R. PATTERSON, a citizen of the UnitedStates, residing at Ohicago, in the county of Cook and State ofIllinois, have invented a certain new and useful Improvement inMagneto-Bells, (Case 85,) of which the following is a full, clear,concise, and exact description, reference being had to the accompanyingdrawings, forming a part of this specification.

My invention relates to that class of electric bells in which theactuating mechanism is placed within the box and the gongs and hammeroutside thereof.

My invention is specially designed to avoid any change in position oradjustment of the gongs by reason of the warping or shrinking orswelling of the wooden case between the gongs and the magnets, while atthe same time I provide a sufficient margin for the adj ustment of thegen gs with respect to the ham mer. Heretofore it has been usual tomount the gongs directly upon the wooden case.

My invention, speaking generally, consists in mounting the gongs uponadjustable plates pivoted to the metallic frame which supports themagnets, the construction being such that these plates will beunaffected by any changes that may take place in the wooden case.

0 I will describe my invention in connection with a magneto-bell of theclass usually employed at the subscribers stations of atelephone-exchange.

The electro-magnet and permanent magnet 3 5 are mounted on a frame onthe inside of the cover or door of the box. Studs project from thisframe through the box and serve as supports for the pivots of theadjustable plates carrying the gongs. The openings in the case 0 forthese studs are large enough to allow the expansion or contraction ofthe cover without in any wise disturbing the position of these studs.The adjustable plates are mounted upon these studs each a shortdistancefrom 5 the cover. The studs are made long enough to hold thepivoted ends of the plates which carry the gongs free from the front ofthe case. On the inside of the case below the frame supporting themagnets I provide abar which is secured at its center to the cover.

The ends of this bar are tapped out to receive screws which are insertedfrom the outside of the box through slots in the lower ends of thegong-supporting plates, the openings for these screws through the coverbeing, like the 5 5 openings for the studs from the frame of the bell,large enough to give sufficient margin for the swelling and shrinking ofthe cover.

A sleeve is inserted in each of these lower holes. The inner ends ofthese sleeves bear against the bar and the outer ends bear against theadj usting-plates below the slots. The screws when inserted through theslots and the sleeves are screwed into the bar, and thus the free endsof the adjusting-plates are held in fixed position, regardless of anychanges in the cover due to shrinkage or expansion.

My invention is illustrated in the accompa- I nying drawings, in which--Figure 1 is a front elevation of a magneto- 7o bell embodying myinvention, one of the gongs being removed. Fig. 2 is a plan view thereofas seen from section-line 0c Fig. 3 is a sectional view upon line y y ofFig. 1.

Like parts are indicated by similar letters of reference throughout thedifferent figures.

The frame a, which supports the magnets, is mounted upon the back of thecover andheld in place by screws 1) b or in any other suitable manner.The studs 0 c extend from the frame a through the openings d cl of thecover, these openings being large enough to permit of any shrinking orswelling of the cover Without bending or changing the position of thestuds. The gongs are mounted upon the studs provided upon the adjustableplates 6 e in proper position to be struck by the hammer f as it isvibrated.

The studs 0 0 may be tapped out to receive the screws g g, which formthe pivotal sup- 0 ports of the plates ee. Any suitablepivotalconnection may be employed. The lower or adjustable ends of the plates 6e are provided each with a slotthat is, the construction is such thatthe lower ends may be moved lat- 5 erally to adjust the position of thegongs with respect to the bell-hammerf.

It will be observed that the bar h is secured at one point only,preferably at its center h to the under side of the cover. Any othermeans of holding this bar so that it will not be changed in position bychanges in the wood might be employed. The screw-holes i 11 are providedat the ends of this bar, and the sleeves k 7t-,being inserted throughthe holes Z Z' are pressed between the bar and the free ends of theplates 6 e,when the screws m m are tightened. The holes Z I, throughwhich these sleeves are inserted, are somewhat larger than the sleevesto give proper margin for changes in the cover. Thus the lower or freeends of the adjustable plates are fastened or secured in place, so as tobe unaffected by changes in the cover.

The adjustable plates 6 6', upon which the gongs are mounted, willremain at all times unaffected as to position by any changes due toexpansion or shrinkage of the cover, since these plates are secured attheir pivotal ends to the metallic frame supporting the magnets and areheld at their adjustable ends to abar supported in such manner upon thecover as not to be moved or changed in position by such changes in thecover.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In an electric bell,the combination,with the frameattached to one side of a board, of studs projecting freely through theboard and adjustable gong-supporting plates pivoted to said studs, saidplates being supported and held free from the board, substantially asand for the purpose specified.

2. The combination,with the metallic frame of an electric bell, of thecase or door of the box, to the rear of which the frame is attached, ofpivotal supports projecting freely through said door or case of the box,the adjustable plates supporting the gongs pivoted to said supports,said plates being provided each at its free end with an adjustablefastening to a bar It, substantially as and for the purpose specified.

3. The combination, with the gongs of an electric bell supported uponadjustable plates c e, of the bar 71, secured at h to the wooden case ordoor, the sleeves 7.: 7a and means for holding the same between the bar,and adjustable plates independent of the said wooden door or case,whereby the position of the gongs once adjusted is maintainednotwithstanding expansion or shrinkage of the case or door.

4. The combination, with the wooden door or cover, of the frame mountedon the rear side thereof and provided with two studs freely projectingthrough the board, the bar supported upon the rear of the board andprovided, also, with two studs projecting freely through the board, andthe adjustable gongsupports upon said studs free from the wooden door orcover, substantially as and for the purpose specified.

In witness whereof I hereunto subscribe my name this 22d day of May, A.D. 1890.

WILLIAM R. PATTERSON.

Witnesses:

GEORGE P. BARTON, ELLA EDLER.

